A magnesium-aluminum double-shot die-casting machine and a shot-casting system

Abstract

The present application discloses a magnesium-aluminum dual-shot die-casting machine and a die-shot system, wherein the magnesium-aluminum dual-shot die-casting machine comprises a die-casting body, an injection module and a melt module, wherein the injection module is mounted on the side of the die-casting body and is arranged in a straight line with the die-casting body, and the melt module is matched and connected with the injection module and is arranged vertically with the die-casting body; the magnesium-aluminum dual-shot die-casting system uses the above-mentioned magnesium-aluminum dual-shot die-casting machine. The beneficial effects of the present application are as follows: by installing the magnesium melt module on the existing cold chamber die-casting machine, two modes of magnesium alloy injection and aluminum alloy injection are realized, thereby realizing the use of two different forms of molten metal on the same die-casting machine, so that there is no need to use two independent die-casting machines, which significantly reduces the equipment cost and space occupation.

Description

Technical Field

[0001] The present application relates to the technical field of die-casting machines, and in particular to a magnesium-aluminum dual-shot die-casting machine and a shot-casting system. Background Art

[0002] Die casting machine is a machine used for pressure casting. It includes hot press chamber and cold press chamber. Later, it was divided into two types: vertical and horizontal. The die casting machine hydraulically injects molten metal into the mold under pressure and cools it into shape. After the mold is opened, a solid metal casting can be obtained. It was originally used for die casting lead type.

[0003] In the process of product die-casting, different products have different materials, for example, there are aluminum alloy die-casting and magnesium alloy die-casting. For aluminum alloy, the die-casting molten metal is pure liquid, while for magnesium alloy, the die-casting molten metal is a solid-liquid mixed state. Therefore, products of the two materials require two independent corresponding die-casting machines, which increases the equipment cost and floor space. For this reason, a magnesium-aluminum dual-shot die-casting machine is proposed to solve the above technical problems. Summary of the invention

[0004] One of the purposes of the present application is to provide a magnesium-aluminum dual-shot die casting machine.

[0005] Another object of the present application is to provide a magnesium-aluminum dual-injection system.

[0006] In order to achieve the above objectives, the technical solution adopted in the present application is: a magnesium-aluminum dual-shot die-casting machine, comprising a die-casting body, an injection module and a melt module, the injection module is installed on the side of the die-casting body and is arranged in a straight line with the die-casting body, and the melt module is matched and connected with the injection module and is arranged vertically with the die-casting body; when performing the first mode die-casting, the injection module is suitable for injecting the added first form of molten metal into the die-casting body for molding; when performing the second mode die-casting, the melt module is suitable for first injecting the second form of molten metal into the injection module, and then the injection module is suitable for injecting the second form of molten metal into the die-casting body for molding.

[0007] Preferably, a thrust mechanism is installed on the die-casting machine body, and the thrust mechanism cooperates with the injection module and is arranged in a straight line corresponding to the melt module; the thrust mechanism is suitable for driving the injection module and the melt module to cooperate with each other so that the injection module and the melt module remain in a sealed state.

[0008] Preferably, a limit rod symmetrically distributed up and down is installed through the fixed template of the die-casting machine body, and the melt module cooperates with the first end of the limit rod to achieve limit locking of the melt module; the thrust mechanism is locked and installed through the second end of the limit rod.

[0009] Preferably, the injection module includes an injection barrel, an extrusion barrel and an injection nozzle. The injection barrel is installed on the fixed mold plate of the die-casting machine body. The ends of the injection barrel are connected to the extrusion barrel and the injection nozzle in sequence. The injection nozzle cooperates with the cavity of the die-casting machine body, and the extrusion barrel cooperates and is connected with the melt module.

[0010] Preferably, the thrust mechanism includes a thrust cylinder and a push head, wherein the thrust cylinder is installed on the fixed template and a push head is installed at one end of the piston rod; the thrust cylinder is suitable for driving the push head to abut against and act on the extrusion barrel, thereby making the extrusion barrel and the injection head of the melt module abut against and seal with each other.

[0011] Preferably, the inner diameter of the injection head is smaller than the inner diameter of the extrusion barrel, and the inner diameter of the injection nozzle is smaller than the gate diameter in the cavity.

[0012] A magnesium-aluminum dual-shot system uses the above-mentioned magnesium-aluminum dual-shot die-casting machine. When performing the first mode of die-casting, it includes the following steps: slow shot, fast shot and boost shot; when performing the second mode of die-casting, it includes the following steps: fast shot and boost shot.

[0013] Preferably, the magnesium-aluminum dual-injection system includes an accumulator, an injection cylinder, a booster cylinder and a valve module connected through an oil circuit; the valve module includes a switch valve V5, a switch valve V8, a servo valve V9 and check valves V11 and V13; the output end of the oil pump is connected to the rod chamber of the injection cylinder through the check valve V11 and the servo valve V9 connected in series to form a first oil circuit; the output end of the oil pump is connected to the rodless chamber of the injection cylinder through the check valve V11, the check valve V13, the switch valve V8 and the switch valve V5 connected in series to form a second oil circuit; when the oil pump is supplying oil alone during slow injection, the oil pump supplies oil to the rodless chamber of the injection cylinder through the connected second oil circuit, and the first oil circuit and the second oil circuit form a differential circuit.

[0014] Preferably, the valve module also includes a servo valve V7; the oil tank is connected to the rod chamber of the injection cylinder through the servo valve V7 to form a third oil circuit; during the rapid injection and braking stages, the accumulator supplies oil to the rodless chamber of the injection cylinder through the switch valve V4 and the switch valve V5; at the same time, the pressure oil in the rod chamber of the injection cylinder flows back to the oil tank along the servo valve V7; at this time, the first oil circuit is connected to the third oil circuit to form an A-type half-bridge structure, and the injection speed of the injection cylinder is adjusted by controlling the opening of the servo valve V7 and the servo valve V9.

[0015] Preferably, the valve module also includes a switching valve V6; the accumulator is connected to the rodless chamber of the boosting cylinder through the switching valve V4 to form a fourth oil circuit; the oil tank is connected to the rod chamber of the boosting cylinder through the servo valve V7 and the switching valve V6 connected in series to form a fifth oil circuit; the output end of the oil pump is connected to the rod chamber of the boosting cylinder through the one-way valve V11, the servo valve V9 and the switching valve V6 connected in series to form a sixth oil circuit; when performing the boosting and injection stage, the accumulator supplies oil to the rodless chamber of the boosting cylinder through the connected fourth oil circuit; the pressure oil in the rod chamber of the boosting cylinder and the injection cylinder flows back to the oil tank along the connected fifth oil circuit and the servo valve V7 respectively; at this time, the sixth oil circuit is connected to the fifth oil circuit to form an A-type half-bridge structure, and the boost pressure of the boosting cylinder is adjusted by controlling the opening of the servo valve V9 and the servo valve V7.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] (1) The present invention realizes two modes of magnesium alloy injection and aluminum alloy injection by installing a magnesium melt module on an existing cold chamber die-casting machine, thereby realizing the use of two different forms of molten metal on the same die-casting machine. In this way, there is no need to use two independent die-casting machines, which significantly reduces equipment costs and space occupancy.

[0018] (2) The present invention uses a special injection system, that is, the magnesium-aluminum dual injection mode shares a set of injection systems. Especially for semi-solid magnesium materials, the die-casting machine will no longer have a slow injection stage, that is, the oil circuit will not be differential, and it will directly enter the high-speed stage after energy storage is completed, thereby simplifying the operation process and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the local structure of the present invention.

[0021] Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure.

[0022] Figure 4 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0023] Figure 5 It is a schematic diagram of the installation structure between the melt module, the injection module and the thrust mechanism of the present invention.

[0024] Figure 6 It is a schematic diagram of the overall structure of the melt glue module of the present invention.

[0025] Figure 7 It is a schematic diagram of the specific structure of the melt glue module of the present invention.

[0026] Figure 8 This is a schematic diagram of the principle of injecting and transporting magnesium particles according to the present invention.

[0027] Fig. 9 It is a schematic diagram of the principle of the magnesium particles of the present invention when they are melted and then injected.

[0028] Fig.10 It is a schematic diagram of the screw structure of the present invention.

[0029] Fig.11 It is a schematic diagram of the principle of the magnesium material of the present invention when it flows through the screw head and when it flows back.

[0030] Fig.12 It is a schematic diagram of the specific structure of the screw head of the present invention.

[0031] Fig.13 It is a schematic diagram of the mold bridge assembly of the present invention.

[0032] Fig.14 This is a schematic diagram of the state of the die-casting metal liquid when it is in the injection barrel.

[0033] Fig.15 It is a schematic diagram of the working principle of slow injection in the present invention.

[0034] Fig.16 It is a schematic diagram of the working principle of rapid injection in the present invention.

[0035] Fig.17 It is a schematic diagram of the working principle of the pressurized injection in the present invention.

[0036] In the figure: 1. die casting machine body; 2. fixed plate; 3. injection module; 301. injection barrel; 302. extrusion barrel; 303. injection nozzle; 4. melt module; 401. melt barrel; 402. conveying mechanism; 4021. mounting block; 4022. screw; 4023. driving device; 403. injection module group; 4031. injection seat; 4032. injection cylinder; 5. thrust mechanism; 501. thrust oil Cylinder; 502, ejector head; 6, injection head; 7, limit rod; 8, feed port; 9, screw head; 901, rod head; 902, blocking part; 903, gasket; 904, check ring; 905, collar; 10, material trough; 11, flow channel; 12, gap; 13, mold bridge assembly; 14, mold bridge; 15, tray cylinder; 16, injection mold plate; 17, booster cylinder; 18, accumulator; 19, injection cylinder. DETAILED DESCRIPTION

[0037] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0038] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0039] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0040] One of the preferred embodiments of the present application is as follows: Figures 1 to 17 As shown, a magnesium-aluminum dual-shot die-casting machine includes a die-casting body 1, an injection module 3 and a melt module 4, wherein the injection module 3 is installed on the side of the die-casting body 1 and is arranged in a straight line with the die-casting body 1, and the melt module 4 is matched and connected with the injection module 3 and is arranged vertically with the die-casting body 1.

[0041] It is understandable that when the die-casting machine is in use, it has two die-casting modes. When performing the first mode of die-casting, the injection module 3 can inject the added first-form molten metal into the die-casting machine body 1 for molding. When performing the second mode of die-casting, the melt module 4 can first inject the second-form molten metal into the injection module 3, and then the injection module 3 can inject the second-form molten metal into the die-casting machine body 1 for molding. In this way, the use of two different forms of molten metal on the same die-casting machine is realized, so that there is no need to use two independent die-casting machines, thereby saving equipment cost and space.

[0042] Specifically in this application, there are two modes, namely aluminum alloy die-casting and magnesium alloy die-casting. Therefore, in the first mode (aluminum alloy) die-casting, we know that the melting point of aluminum alloy is relatively high, so hot chamber die-casting machines cannot be used for production, but only cold chamber die-casting can be used, that is, the aluminum alloy metal is melted outside the machine, and then the melted first form of molten metal (i.e. aluminum liquid) is added to the injection module 3, and the first molten metal is injected into the die-casting machine through the injection module 3. When the second mode (magnesium alloy) die-casting is performed, the second form of molten metal (i.e. magnesium liquid) is first added to the injection module 3 through the melt module 4, and then the second form of molten metal is injected into the die-casting machine through the injection module 3. In other words, the two forms of molten metal share one injection module 3 during die-casting, and thus two different die-casting modes can be flexibly realized.

[0043] As a further description of the above embodiment: Figure 4 As shown, the injection module 3 includes an injection barrel 301, an extrusion barrel 302 and an injection nozzle 303. The injection barrel 301 is installed on the fixed mold plate 2 of the die-casting machine body 1. The ends of the injection barrel 301 are connected with the extrusion barrel 302 and the injection nozzle 303 in sequence. The injection nozzle 303 cooperates with the cavity of the die-casting machine body 1, and the extrusion barrel 302 cooperates with the melt module 4. It can be understood that the melt module 4 transports the melted second form of molten metal to the extrusion barrel 302 and enters the injection barrel 301, and then injects the second form of molten metal into the die-casting machine through the injection punch in the injection module 3; it should be noted that how the injection module 3 injects the molten metal in the injection barrel 301 into the die-casting machine is also common knowledge known to those skilled in the art, so it will not be described in detail.

[0044] In this embodiment, Figure 6 As shown, the melt module 4 includes a melt cylinder 401 installed on a workbench, a conveying mechanism 402 and an injection module 403. The injection head 6 at the end of the melt cylinder 401 is in contact with the extrusion cylinder 302 (as shown in FIG. Figure 4 As shown in the figure, the conveying mechanism 402 is arranged inside the melt cylinder 401 and cooperates with the injection module 403.

[0045] It can be understood that when performing the die casting of mode 2 (i.e., magnesium alloy die casting), the melt module 4 will perform two processes. In the first process, solid magnesium metal particles can be put into the melt cylinder 401 from the feed port 8, and then the magnesium particles can be transported, filled and distributed in the melt cylinder 401 through the conveying mechanism 402, such as Figure 8As shown (it should be noted that at this time, the magnesium metal particles are equivalent to squeezing out the air in the melt tube 401, which will avoid the subsequent oxidation of the magnesium alloy by the air), at this time, the heating component on the melt tube 401 will melt the metal particles to obtain the second form of molten metal, that is, semi-solid molten metal (liquid encapsulating solid particles). Second process: At this time, the injection module 403 and the conveying mechanism 402 cooperate to inject the second form of molten metal from the injection head 6 into the extrusion barrel 302, realizing the subsequent die casting of mode 2.

[0046] Furthermore, the inner diameter of the injection head 6 is smaller than the inner diameter of the extrusion barrel 302, and the inner diameter of the injection nozzle 303 is smaller than the diameter of the gate in the cavity. Of course, the gate is not shown in this application, but this is also common knowledge for those skilled in the art. Specifically, the ball diameter of the injection head 6 is slightly smaller than the ball diameter of the extrusion barrel 302, and the diameter of the injection nozzle 303 is slightly smaller than the gate diameter. This structural design can avoid the accumulation of cold material at the gate and prevent the molten magnesium material from spraying out, which can achieve a good sealing effect and smooth flow of magnesium material.

[0047] like Figure 7 As shown, the conveying mechanism 402 includes a mounting block 4021, a screw 4022 and a driving device 4023 (such as a motor), wherein the screw 4022 is similar to a spiral auger structure, and the screw 4022 can be rotated to convey the material. The mounting block 4021 is horizontally slidably mounted on a workbench (such as Figure 2 As shown, the melt glue module 4 is completely installed on the workbench), the driving device 4023 is installed on the mounting block 4021, the screw 4022 is located in the melt glue cylinder 401, and the first end (right end) of the screw 4022 is rotatably set on the mounting block 4021 and connected to the output shaft of the driving device 4023 through a spline, that is, the screw 4022 can not only rotate axially, but also move axially. The mounting block 4021 is matched and connected with the injection module 403.

[0048] It is understandable that when performing the first process, Figure 8As shown, magnesium particles are conveyed. At this time, the driving device 4023 can drive the screw 4022 to rotate, thereby conveying the magnesium particles entering the feed port 8 of the melt tube 401 and distributing them into the melt tube 401. At this time, the feed port 8 can be closed to ensure the sealing of the melt tube 401 and prevent contact with the outside air. We know that while the screw 4022 has a conveying force on the magnesium particles, the magnesium particles will also have a reaction force on the screw 4022, thereby causing the screw 4022 to move in the direction away from the melt tube 401 under this reaction force; of course, at the same time, the injection module 3 will also drive the mounting block 4021 away from the melt tube 401, thereby causing the driving device 4023 to also move away and not interfere with the movement of the screw 4022. It should be noted that the retreat of the screw 4022 in this process is to prepare for the injection of magnesium material in the second process.

[0049] When the second process is carried out, Fig. 9 As shown, at this time, the injection module 403 will drive the mounting block 4021 to reset and approach the melt tube 401, that is, the screw 4022 will move toward the inside of the melt tube 401 under the action of the driving device 4023, and while moving, the magnesium material will be injected into the injection head 6 under the action of the screw head 9 at the second end (left end) of the screw 4022, and then injected into the injection module 3 from the injection head 6.

[0050] As a further description of the above embodiment: Fig. 9 As shown, the injection module 403 includes an injection seat 4031 and an injection cylinder 4032. The injection seat 4031 is installed on the workbench and corresponds to the mounting block 4021. The melt cylinder 401 is fixedly installed on the injection seat 4031. The cylinder body of the injection cylinder 4032 is hingedly installed with a first connecting seat, and the piston end of the injection cylinder 4032 is hingedly installed with a second connecting seat. The first connecting seat is installed on the injection seat 4031, and the second connecting seat is installed on the mounting block 4021.

[0051] It is understandable that the cylinder body and piston rod of the shooting and displacement oil cylinder 4032 are both hingedly mounted on two connection seats, and the two connection seats are respectively fixedly mounted on the injection seat 4031 and the mounting block 4021, thereby realizing the fixed installation of the shooting and displacement oil cylinder 4032. Through such hinged installation, its function is: for example, when the mounting block 4021 fails, the second connection seat can be disassembled at this time, and then the shooting and displacement oil cylinder 4032 can be rotated around the piston rod and away from the mounting block 4021, so that the interference caused by the shooting and displacement oil cylinder 4032 when the mounting block 4021 is repaired can be eliminated. Moreover, only the cylinder body of the shooting and displacement oil cylinder 4032 needs to be disassembled, which is simple and convenient, and at the same time, the installation efficiency of the shooting and displacement oil cylinder 4032 can be greatly improved after the later maintenance.

[0052] like Figure 4 and Figure 5 As shown, the entire melt module 4 is vertically arranged with the die-casting machine body 1, and the melt module 4 is butted and connected by the injection head 6 against the extrusion barrel 302; and the extrusion barrel 302 may shake during the long-term extrusion process, thereby affecting the connection and sealing effect of the two.

[0053] Therefore, in order to solve the above technical problems, in one embodiment of the present application, Figure 1 and Figure 4 As shown, a thrust mechanism 5 is installed on the die casting machine body 1, and the thrust mechanism 5 cooperates with the injection module 3 and is arranged in a straight line corresponding to the melt module 4. It can be understood that at this time, the thrust mechanism 5 can make the injection module 3 and the melt module 4 always match each other, so that the injection module 3 and the melt module 4 are always kept in a sealed state, thereby ensuring the stable transportation of magnesium material during the die casting process.

[0054] Specifically, Figure 4 As shown, the thrust mechanism 5 includes a thrust cylinder 501 and a push head 502. The thrust cylinder 501 is installed on the fixed mold plate 2 and the push head 502 is installed at one end of the piston rod. It can be understood that when die casting is performed, the thrust cylinder 501 extends and drives the push head 502 to abut against the outside of the extrusion barrel 302, that is, during the injection process, the thrust cylinder 501 pushes the push head 502 to always apply pressure to the extrusion barrel 302, and at the same time acts on the injection head 6 and the melt cylinder 401, playing a sealing role, thereby ensuring the stable transportation of magnesium material during the die casting process. Of course, the extension and retraction action of the thrust cylinder 501 is precisely controlled by the control system to adapt to the different pressure requirements of different die casting stages.

[0055] In this embodiment, Figure 5 As shown in (a) and (b), in order to further improve the stability of the installation of the melt module 4 and the convenience of the installation of the thrust cylinder 501, a limit rod 7 symmetrically distributed up and down is installed in the fixed mold plate 2. Specifically, a connecting rod can also be installed on the upper and lower sides of the melt module 4, and then the connecting rod is docked and fixed with the first end (left end) of the limit rod 7, so that the limit locking of the melt module 4 can be achieved. A vertical plate can be fixedly installed on the second end (right end) of the limit rod 7 by bolts, and then the thrust cylinder 501 is fixedly installed on the vertical plate to achieve the locking installation of the thrust mechanism 5. It can be seen that by setting a pair of limit rods 7, the limit locking of the melt module 4 and the locking installation of the thrust mechanism 5 can be achieved, and the linear setting of the thrust mechanism 5 and the melt module 4 can be ensured, thereby ensuring the stability and safety of the entire die-casting process.

[0056] In one of the embodiments of the present application, Figures 10 to 12As shown, the screw head 9 includes a rod head 901, a blocking portion 902, a check ring 904, a collar 905 and a washer 903. The rod head 901 is installed on the second end (left end) of the screw rod 4022 through a thread, thereby realizing quick disassembly and assembly between the screw head 9 and the screw rod 4022; the blocking portion 902 and the washer 903 are both arranged on the outside of the rod head 901 and a gap is formed therebetween, a plurality of material grooves 10 are arranged on the outside of the blocking portion 902, the collar 905 is sleeved on the outside of the check ring 904 and abuts against the inner wall of the melt cylinder 401, the check ring 904 is sleeved on the rod head 901 and corresponds to the gap, the axial length of the check ring 904 is less than the length of the gap, and a flow channel 11 connected to the material groove 10 is formed between the inside of the check ring 904 and the gap.

[0057] It is understandable that the flow direction of the magnesium material in the melt cylinder 401 is as follows: Fig.11 As shown in (c) (i.e., the direction of the arrow): Since the check ring 904 is movably sleeved on the rod head 901, the check ring 904 will abut against the blocking portion 902 on the left side under the flow force of the magnesium material, and a gap 12 will be formed between the check ring 904 and the gasket 903 on the right side. Under the conveying action of the screw 4022, the magnesium material on the right side of the melt cylinder 401 will flow from the gap 12, the flow channel 11 and the material trough 10 to the storage chamber on the left side of the melt cylinder 401, as shown in FIG. Figure 8 shown.

[0058] When injecting, Fig. 9 As shown, the screw head 9 moves to the left under the action of the screw rod 4022, and then the magnesium material in the storage chamber is injected from the injection head 6 into the injection module 3. Of course, during the injection process, due to the reaction force of the magnesium material, the magnesium material will flow back, such as Fig.11 As shown in (d) in the figure, the check ring 904 will resist the right side gasket 903 under the reaction force, so that the gap 12 will be closed, thereby blocking the magnesium material and preventing the backflow, thereby improving the utilization rate of the magnesium material. Fig.12 As shown, a plurality of gaps can be provided on the right side of the check ring 904, so that when the check ring 904 and the gasket 903 are against each other, the gap 12 will be reduced and will not be closed due to the existence of the gap, so as to prevent the magnesium material from acting too hard and causing the melt cylinder 401 or the extrusion cylinder 302 to leak, that is, at this time, the gap 12 can buffer the reflux force of the magnesium material while ensuring that the magnesium material is fully injected, thereby ensuring the smooth progress of the entire die-casting process. Of course, in the specific setting of the gap 12, whether to make the gap 12 smaller or closed during reflux, the technicians in this field can choose according to the actual situation.

[0059] In this embodiment, Figure 1As shown, the injection mold plate 16 is installed on the left side of the fixed mold plate 2, that is, inside the die casting machine body 1. In actual use, for different models of products, the models of the injection mold plate 16 are different, and the fixed mold plate 2 is fixedly installed, which will cause inconvenience when replacing the injection mold plate 16. It should be known that a fixed mold insert is installed on the injection mold plate 16, and a movable mold plate and a movable mold insert connected to the movable mold plate are installed in the area corresponding to the injection mold plate 16 in the die casting machine body 1. The fixed mold insert and the movable mold insert cooperate to form a die casting machine cavity (i.e., a mold cavity), which is also common knowledge known to those skilled in the art.

[0060] Therefore, in order to solve the above technical problems, Fig.13 As shown, the entire mold bridge assembly 13 can be installed on the frame inside the die-casting machine body 1, the fixed mold plate 2 is fixedly installed at the right side of the mold bridge assembly 13, the mold bridge 14 is slidably set in the mold bridge assembly 13, the injection mold plate 16 is installed on the mold bridge 14, and a pallet cylinder 15 is installed at the bottom end of the fixed mold plate 2, and one end of the piston rod of the pallet cylinder 15 is connected to the mold bridge 14.

[0061] It is understandable that when the pallet cylinder 15 is shortened so that the injection mold plate 16 is close to and abuts against the fixed mold plate 2, the injection mold plate 16 can be installed and used. When disassembling, the injection mold plate 16 is first extended by the pallet cylinder 15 to move away from the fixed mold plate 2, and then the injection mold plate 16 and the mold bridge 14 can be disassembled. It should be known that compared with the prior art, the original installation between the injection mold plate 16 and the fixed mold plate 2 is actually designed to be installed between the injection mold plate 16 and the mold bridge 14, and the position of the mold bridge 14 can be moved and adjusted under the action of the pallet cylinder 15, so as to facilitate the disassembly and assembly of the fixed mold plate 2 in the later stage.

[0062] The working principle of the magnesium-aluminum dual-shot die casting machine in the present invention is:

[0063] First, the user selects the corresponding mode according to the injection molded product. For example, the aluminum alloy injection mode is selected through the operation screen on the die-casting machine, which means that there is no need to use magnesium alloy injection. Therefore, the built-in parameters of the system will be suitable for aluminum alloy die-casting. Specifically, the molten aluminum liquid from the outside is added to the injection module 3, and then the aluminum liquid is injected into the die-casting machine through the injection module 3 for molding.

[0064] When the magnesium alloy injection mode is adjusted, the magnesium raw material undergoes two processes under the action of the melt module 4, wherein the first process is: Figure 8As shown, magnesium particles are fed into the melt tube 401 from the feed port 8 (corresponding to the upper end of the injection seat 4031), and the driving device 4023 drives the screw 4022 to rotate and store materials. At this time, the screw 4022 retreats due to the reaction of squeezing the magnesium particles, and the mounting block 4021 also retreats under the action of the injection cylinder 4032. After the storage is completed, the mounting block 4021 resets and advances under the action of the injection cylinder 4032, pushing the semi-molten magnesium in the melt tube 401 from the injection head 6 into the extrusion tube 302, and finally injecting the semi-solid magnesium into the mold through the injection module 3 to complete the entire injection process.

[0065] It should be noted that the injection barrel 301, the extrusion barrel 302, the injection nozzle 303, the melt barrel 401, and the injection head 6 are all equipped with heating coils on the outside to heat the material to a semi-solid state during the transportation process and keep the temperature of the magnesium liquid constant. At the same time, compared with the traditional cold chamber die-casting machine, the invention can significantly reduce energy consumption by greatly reducing the working temperature, reducing the magnesium content of the product casting and the high power of the system. At the same time, the magnesium melt module 4 is in a fully enclosed environment to complete the injection, and there is no need to use SF6 protective gas, which reduces costs while improving safety and achieving the purpose of environmental protection. At the same time, by simplifying the injection system and separating the melt structure from the injection structure, the magnesium melt module 4 can be easily installed on the existing cold chamber die-casting machine, reducing the equipment configuration and maintenance costs, and achieving smooth and continuous production.

[0066] It should be known that the injection action of the existing cold chamber die-casting machine is divided into three processes: slow injection, fast injection and pressurized injection; among them, the injection cylinder 19 needs to be braked before completing the fast injection and preparing for the pressurized injection; after the die-casting machine completes the injection action, it is also necessary to perform a pressure relief process, a tracking process and a hammer return process to return to the initial position. Of course, these are also common knowledge known to technical personnel in this field.

[0067] like Fig.14 As shown, we know that the molten metal in the injection barrel 301 is injected into the die-casting machine body 1 through the injection punch. For the aluminum liquid, since the aluminum liquid is a pure liquid, a slow injection process is required in the initial process of injection. If a fast injection is performed in the early stage, the aluminum liquid will generate a large thrust and fluctuate, thereby generating a "surge" that affects the molding quality. When the aluminum liquid fills the injection barrel 301, a fast injection process can be performed.

[0068] Therefore, another aspect of the present application provides a magnesium-aluminum dual-shot die-casting system, which uses the above-mentioned magnesium-aluminum dual-shot die-casting machine, and when performing the first mode (i.e., aluminum alloy) die-casting, includes the following steps: slow shot, fast shot, and pressure shot. And when performing the second mode (i.e., magnesium alloy) die-casting, includes the following steps: fast shot and pressure shot.

[0069] It should be known that since magnesium alloy is semi-solid after melting, it will hardly produce the "surge" phenomenon in the aluminum liquid mentioned above when it is pushed, and then there is no need to use the slow injection step in the second mode, thereby simplifying the operation process and improving production efficiency. In actual operation, the two injection modes share a injection system. After selecting the corresponding injection mode through the control panel, the system will automatically adjust the corresponding parameters to meet the injection requirements of different materials.

[0070] As a further description of the above die casting steps: Figures 15 to 17 As shown, the magnesium-aluminum dual injection system includes an accumulator 18, an injection cylinder 19, a booster cylinder 17 and a valve module connected through an oil circuit; the thick solid line in the figure represents a conductive oil circuit, and the dotted line represents an unconductive oil circuit; the oil pump is represented by P, and the oil tank is represented by T.

[0071] Specifically, Fig.15 As shown, the valve module includes a switch valve V4, a switch valve V5, a switch valve V8, a servo valve V9, and one-way valves V11 and V13; the output end of the oil pump is connected to the rod chamber of the injection cylinder 19 through the one-way valve V11 and the servo valve V9 connected in series to form a first oil circuit; the output end of the oil pump is connected to the rodless chamber of the injection cylinder 19 through the one-way valve V11, the one-way valve V13, the switch valve V8, and the switch valve V5 connected in series to form a second oil circuit; when the oil pump is supplying oil alone during slow injection, the oil pump supplies oil to the rodless chamber of the injection cylinder 19 through the connected second oil circuit, and the first oil circuit and the second oil circuit intersect at the output end of the one-way valve V11 to form a differential circuit. Of course, at this time, the pump and the accumulator 18 can jointly supply oil, that is, the accumulator 18 supplies oil to the rodless chamber of the injection cylinder 19 through the switch valve V4 and the switch valve V5, and the oil pump can replenish oil to the accumulator 18 through the conductive switch valve V12.

[0072] It is understandable that differential control is adopted in the slow injection stage. While ensuring the stability of slow injection, the speed of slow injection can also be controlled by controlling the flow of the rod chamber of the injection cylinder 19 through the servo valve V9. And in differential control, the pressure difference before and after the servo valve V9 is smaller than the pressure difference during traditional single outlet control, so that the pressure gain of the servo valve V9 is small, thereby improving the control accuracy of the injection cylinder 19. And before the start of slow injection, since the rod chamber of the injection cylinder 19 has been pressurized in the energy storage stage, the compression amount of the oil in the rod chamber is reduced when the slow injection starts, which can prevent or reduce the start-up shock.

[0073] like Fig.16As shown, the valve module also includes a servo valve V7; the oil tank is connected to the rod chamber of the injection cylinder 19 through the servo valve V7 to form a third oil circuit; during the rapid injection and braking stages, the accumulator 18 supplies oil to the rodless chamber of the injection cylinder 19 through the switch valve V4 and the switch valve V5; at the same time, the pressure oil in the rod chamber of the injection cylinder 19 flows back to the oil tank through the servo valve V7; at this time, the first oil circuit is connected to the third oil circuit to form an A-type half-bridge structure, and the injection speed of the injection cylinder 19 is adjusted by controlling the opening of the servo valve V7 and the servo valve V9.

[0074] It is understandable that, during the rapid injection stage, the opening of the servo valve V7 is large and the opening of the servo valve V9 is small, so that the pressure oil in the rod chamber of the injection cylinder 19 can quickly flow back to the oil tank, thereby generating a faster injection speed. By connecting the first oil circuit to form an A-type half-bridge structure during the rapid injection stage, the flow rate of the rod chamber of the injection cylinder 19 can be quickly adjusted by controlling the opening of the servo valve V9 to achieve precise speed control, thereby reducing or avoiding high-speed overshoot.

[0075] At the same time, during the braking stage, the opening of the servo valve V7 is small, and the opening of the servo valve V9 is large, so that the pressure in the rod chamber of the injection cylinder 19 can be increased to achieve active braking. The oil supply of the oil pump can build up pressure in the rod chamber of the injection cylinder 19 more quickly through the A-type half-bridge structure, completing the active braking action with faster deceleration acceleration.

[0076] like Fig.17 As shown, the valve module also includes a switch valve V6; the accumulator 18 is connected to the rodless chamber of the boost cylinder 17 through the switch valve V4 to form a fourth oil circuit; the oil tank is connected to the rod chamber of the boost cylinder 17 through the servo valve V7 and the switch valve V6 connected in series to form a fifth oil circuit; the output end of the oil pump is connected to the rod chamber of the boost cylinder 17 through the one-way valve V11, the servo valve V9 and the switch valve V6 connected in series to form a sixth oil circuit; when performing the boosting and injection stage, the accumulator 18 supplies oil to the rodless chamber of the boost cylinder 17 through the connected fourth oil circuit; the pressure oil in the rod chambers of the boost cylinder 17 and the injection cylinder 19 flows back to the oil tank along the connected fifth oil circuit and the servo valve V7 respectively; at this time, the sixth oil circuit is connected to the fifth oil circuit to form an A-type half-bridge structure, and the boost pressure of the boost cylinder is adjusted by controlling the opening of the servo valve V9 and the servo valve V7.

[0077] It can be understood that the method of accurately controlling the boost pressure through the A-type half-bridge structure is as follows: in the delayed stage before the start of boost, in order to build pressure faster in the boost injection stage, the servo valve V7 is opened to a preset fixed opening, and the servo valve V9 is also opened to a preset fixed opening. When the pressure of the rodless chamber of the injection cylinder 19 reaches a certain proportion of the preset value of the first section, the opening of the servo valve V7 is reduced to a certain set value; then the opening of the servo valve V9 is adjusted to change the flow through the servo valve V9, so that the flow through the servo valve V9 and the flow of the rod chamber of the boost cylinder 17 will produce a pressure drop when flowing through the servo valve V7. This pressure drop is the pressure of the rod chamber of the boost cylinder 17. The boost pressure can be adjusted by controlling the pressure of the rod chamber of the boost cylinder 17. Therefore, the flow size can be controlled by adjusting the opening of the servo valve V9, and the boost pressure can be controlled by controlling the pressure drop of the servo valve V7. Through this control method, the adjustment accuracy of the boost pressure is higher, and the boost pressure can be adjusted from large to small, that is, the boost pressure can be adjusted back after overshoot occurs.

[0078] It should also be known that when performing boost injection, the switch valve V12 can be turned on, so that the oil pump can replenish oil to the accumulator 18 through the turned-on second oil circuit; by replenishing oil to the accumulator 18, the pressure of the accumulator 18 can be increased, thereby ensuring that the accumulator 18 has sufficient pressure in the subsequent tracking stage. At the same time, the injection cylinder 19 and the boost cylinder 17 share one accumulator 18, and the accumulator 18 is loaded and replenished with oil in both the boost injection stage and the slow injection stage, which can further reduce the volume of the accumulator 18 to reduce costs.

[0079] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A magnesium-aluminum double-shot die casting machine, characterized in that: include: Die-cast body; An injection module, the injection module is installed on the side of the die-casting machine body and is arranged in a straight line with the die-casting machine body; as well as A melt module, the melt module is connected with the injection module and is arranged vertically to the die casting body; when performing the first mode die casting, the injection module is suitable for injecting the added first form of molten metal into the die casting body for molding; when performing the second mode die casting, the melt module is suitable for first injecting the second form of molten metal into the injection module, and then the injection module is suitable for injecting the second form of molten metal into the die casting body for molding; The die-casting machine body is provided with a thrust mechanism, which cooperates with the injection module and is arranged in a straight line corresponding to the melt module; the thrust mechanism is suitable for driving the injection module and the melt module to cooperate with each other, so that the injection module and the melt module maintain a sealed state; The fixed die plate of the die-casting machine body is penetrated by a limit rod symmetrically distributed up and down, and the melt module cooperates with the first end of the limit rod to achieve limit locking of the melt module; the thrust mechanism is locked and installed through the second end of the limit rod; The injection module comprises an injection barrel, an extrusion barrel and an injection nozzle, wherein the injection barrel is installed on the fixed die plate of the die casting machine body, and the ends of the injection barrel are connected with the extrusion barrel and the injection nozzle in sequence, the injection nozzle cooperates with the cavity of the die casting machine body, and the extrusion barrel cooperates with the melt module; The thrust mechanism includes a thrust cylinder and a push head. The thrust cylinder is installed on the fixed template and a push head is installed at one end of the piston rod. The thrust cylinder is suitable for driving the push head to abut against and act on the extrusion barrel, thereby making the extrusion barrel and the injection head of the melt module abut against and seal each other.

2. The magnesium-aluminum dual-shot die casting machine according to claim 1, characterized in that: The inner diameter of the injection head is smaller than the inner diameter of the extrusion barrel, and the inner diameter of the injection nozzle is smaller than the gate diameter in the cavity.

3. A magnesium-aluminum dual-shot die casting system, using the magnesium-aluminum dual-shot die casting machine as claimed in claim 1 or 2, characterized in that: When the first mode die casting is performed, the following steps are included: slow injection, fast injection and pressure-increasing injection; when the second mode die casting is performed, the following steps are included: fast injection and pressure-increasing injection.

4. The magnesium-aluminum dual injection system according to claim 3, characterized in that: The magnesium-aluminum dual-injection system includes an accumulator, an injection cylinder, a booster cylinder and a valve module connected by an oil circuit; the valve module includes a switch valve V5, a switch valve V8, a servo valve V9 and check valves V11 and V13; the output end of the oil pump is connected to the rod chamber of the injection cylinder through the check valve V11 and the servo valve V9 connected in series to form a first oil circuit; the output end of the oil pump is connected to the rodless chamber of the injection cylinder through the check valve V11, the check valve V13, the switch valve V8 and the switch valve V5 connected in series to form a second oil circuit; when the oil pump is supplying oil alone during slow injection, the oil pump supplies oil to the rodless chamber of the injection cylinder through the connected second oil circuit, and the first oil circuit and the second oil circuit form a differential circuit.

5. The magnesium-aluminum dual injection system according to claim 4, characterized in that: The valve module also includes a servo valve V7; the oil tank is connected to the rod chamber of the injection cylinder through the servo valve V7 to form a third oil circuit; during the rapid injection and braking stages, the accumulator supplies oil to the rodless chamber of the injection cylinder through the switch valve V4 and the switch valve V5; at the same time, the pressure oil in the rod chamber of the injection cylinder flows back to the oil tank along the servo valve V7; at this time, the first oil circuit is connected to the third oil circuit to form an A-type half-bridge structure, and the injection speed of the injection cylinder is adjusted by controlling the opening of the servo valve V7 and the servo valve V9.

6. The magnesium-aluminum dual injection system according to claim 5, characterized in that: The valve module also includes a switching valve V6; the accumulator is connected to the rodless chamber of the boosting cylinder through the switching valve V4 to form a fourth oil circuit; the oil tank is connected to the rod chamber of the boosting cylinder through a servo valve V7 and a switching valve V6 connected in series to form a fifth oil circuit; the output end of the oil pump is connected to the rod chamber of the boosting cylinder through a one-way valve V11, a servo valve V9 and a switching valve V6 connected in series to form a sixth oil circuit; when performing the boosting and injection stage, the accumulator supplies oil to the rodless chamber of the boosting cylinder through the connected fourth oil circuit; the pressure oil in the rod chambers of the boosting cylinder and the injection cylinder flows back to the oil tank along the connected fifth oil circuit and the servo valve V7 respectively; at this time, the sixth oil circuit is connected to the fifth oil circuit to form an A-type half-bridge structure, and the boost pressure of the boosting cylinder is adjusted by controlling the opening of the servo valve V9 and the servo valve V7.

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